JP2008001474A - lift device - Google Patents

Abstract

An elevating device capable of reducing the size of the device without increasing the cost is provided.
An elevating platform driving mechanism 4 for elevating and elevating an elevating platform 2 via a pantograph type elevating platform supporting mechanism 3 slides a linear guide installed on the upper surface of the base 1 and a slider of the linear guide in a horizontal direction. In a lifting device comprising a ball screw 6 to be driven and a drive motor 7 that rotationally drives a screw shaft of the ball screw 6, a coil spring 8 that is compressed and deformed by receiving a pressing force from the lifting platform 2 when the lifting platform 2 is lowered. 1 was provided on the upper surface of the first plate.
[Selection] Figure 1

Description

  The present invention relates to an elevating device used for an examination table having a height adjusting function, and more particularly to an elevating device having a pantograph type elevating table support mechanism between a base and an elevating table.

  Conventionally, a lifting device having a pantograph type lifting platform support mechanism between a base and a lifting platform often uses a cylinder device such as a hydraulic cylinder as means for driving the lifting platform up and down (for example, Patent Documents). 1). For this reason, this type of lifting device requires a large cylinder device having substantially the same stroke as the lifting stroke of the lifting platform, and has the disadvantages of increasing the weight and increasing the size of the device. In addition, there is a problem that it is difficult to finely adjust the height of the lifting platform to an arbitrary height, for example, in millimeters.

  Therefore, in order to eliminate such difficulties, the present inventor has devised the lifting device shown in FIG. The lifting device shown in the figure includes a base 1, a lifting base 2 provided above the base 1, and a pantograph type lifting base support mechanism 3 provided between the lifting base 2 and the base 1. The elevator 2 is driven up and down by the elevator drive mechanism 4 via the pantograph type elevator support mechanism 3.

  As shown in FIG. 6, the lifting platform drive mechanism 4 horizontally connects a pair of linear guides 51 and 52 installed on the upper surface of the base 1 and sliders 51 a and 52 a of the linear guides 51 and 52. And a drive motor 7 that rotationally drives a screw shaft 6 a of the ball screw 6. A nut 6 b of the ball screw 6 is fixed to sliders 51 a and 52 a of the linear guides 51 and 52. Yes.

Therefore, when the screw shaft 6a of the ball screw 6 is rotationally driven in a predetermined direction by the drive motor 7, and the nut 6b of the ball screw 6 and the sliders 51a and 52a of the linear guides 51 and 52 are linearly moved accordingly, FIG. As shown, the elevating platform 2 is moved up and down as the pantograph type lifting platform support mechanism 3 extends upward or shortens downward.
JP 2005-170572 A

  Such a lifting device does not require the use of a cylinder device such as a hydraulic cylinder as means for driving the lifting platform 2 up and down, so that the lifting device can be made compact. Also, a pair of linear guides 51 and 52 in which a lifting platform driving mechanism 4 for driving the lifting platform 2 up and down via the pantograph type lifting platform support mechanism 3 is installed on the upper surface of the base 1 in parallel with each other, and these linear guides Since the slider 51a, 52a of the slider 51, 52 includes a ball screw 6 that slides in the horizontal direction and a drive motor 7 that rotationally drives the screw shaft 6a of the ball screw 6, the height of the lifting platform 2 is increased. Although it can be finely adjusted in millimeters, it has the following problems to be improved.

That is, in the elevating device shown in FIG. 5, when the pantograph type elevating platform support mechanism 3 is somewhat extended, the elevating platform 2 can be driven up and down with a relatively low torque. ), When the pantograph type lifting platform support mechanism 3 is in the folded state, a relatively large torque is required to push up the lifting platform 2. For this reason, it is necessary to use a motor having a large torque as the drive motor 7 for driving the screw shaft 6a of the ball screw 6, and there is a problem in that the cost increases.
The present invention has been made paying attention to the above-described problems, and an object of the present invention is to provide an elevating apparatus capable of downsizing the apparatus without increasing the cost.

In order to achieve the above object, the invention of claim 1 includes a base, a lift provided above the base, and a pantograph lift provided between the lift and the base. A platform support mechanism and a platform drive mechanism that drives the platform up and down via the pantograph type platform support mechanism, and the platform drive mechanism is installed on the top surface of the base. In a lifting device comprising a guide, a ball screw that slides the slider of the linear guide in the horizontal direction, and a drive motor that rotationally drives the screw shaft of the ball screw, the lifting and lowering is performed when the lifting platform is lowered. An elastic body that compresses and deforms by receiving a pressing force from the base or the base is provided on the upper surface of the base or the lower surface of the lift base.
According to a second aspect of the present invention, in the lifting device according to the first aspect, a plurality of the elastic bodies are provided on the upper surface portion of the base or the lower surface portion of the lifting table.

  According to the lifting device of the present invention, even when the pantograph lifting platform support mechanism is in the folded state, the lifting platform can be driven up and down with relatively low torque, and the drive motor that rotationally drives the screw shaft of the ball screw Therefore, since it is not necessary to use a motor with a large torque, the apparatus can be made compact without increasing the cost. Further, the height of the lifting platform can be finely adjusted to an arbitrary height.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
A first embodiment of the present invention is shown in FIGS. The lifting device shown in FIG. 1 includes a base 1, a lift 2 provided above the base 1, and a pantograph lift base support mechanism 3 provided between the lift 2 and the base 1. The elevator 2 is driven up and down by the elevator drive mechanism 4 shown in FIG. 2 via the pantograph type elevator support mechanism 3.

The elevator drive mechanism 4 includes a pair of linear guides 51 and 52 installed in parallel to each other on the upper surface of the base 1, and a ball screw 6 that slides the sliders 51 a and 52 a of the linear guides 51 and 52 in the horizontal direction. The nut 6b of the ball screw 6 is fixed to the sliders 51a, 52a of the linear guides 51, 52. The drive motor 7 rotates the screw shaft 6a of the ball screw 6.
The base 1 has an upper surface portion 1 a that faces the lower surface portion 2 a of the lifting platform 2, and a coil spring 8 as an elastic body is erected near the center of the upper surface portion 1 a.

  In such a configuration, when the elevator 2 is lowered from the state shown in FIG. 3A, the lower surface 2 a of the elevator 2 comes into contact with the upper end of the coil spring 8 as shown in FIG. When the elevator 2 is further lowered, the coil spring 8 is compressed and deformed by receiving a pressing force from the elevator 2 as shown in FIG. At this time, the spring force of the coil spring 8 acts on the lower surface portion 2a of the elevator 2 as an urging force for urging the elevator 2 upward, so that the pantograph type elevator support mechanism 3 is in the state shown in FIG. That is, even in the folded state, the lifting platform 2 can be driven up and down with a relatively low torque. As a result, it is not necessary to use a motor having a large torque as the drive motor 7 that rotationally drives the screw shaft 6a of the ball screw 6, so that the apparatus can be made compact without increasing the cost. Further, the height of the lifting platform 2 can be finely adjusted, for example, in millimeters.

In the embodiment described above, the coil spring is exemplified as the elastic body that receives the pressing force from the elevator 2 and compresses and deforms, but is not limited thereto. For example, a sponge or rubber may be used as an elastic body that is compressed and deformed by receiving a pressing force from the elevator 2.
In the above-described embodiment, the coil spring 8 installed on the upper surface 1a of the base 1 is compressed and deformed by the pressing force from the lift 2 to bias the lift 2 upward. The elastic body may be fixed to the lower surface portion of the lifting platform 2 and the elastic body may be compressed and deformed by the pressing force from the base 1 to urge the lifting platform 2 upward.

  Further, in the above-described embodiment, an example in which one coil spring 8 is installed on the upper surface portion of the base 1 is illustrated. However, as shown in FIG. 4, a plurality of coil springs 8 are installed on the upper surface portion of the base 1. May be. In the above-described embodiment, the lifting platform 2 is biased upward by the spring force of the coil spring 8. However, the lifting platform 2 may be biased upward by the repulsive force of the magnet.

It is a front view of the raising / lowering apparatus which concerns on the 1st Embodiment of this invention. It is sectional drawing which follows the II-II line of FIG. It is a figure for demonstrating the effect | action of the raising / lowering apparatus which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the modification of the raising / lowering apparatus which concerns on the 1st Embodiment of this invention. It is a front view of the conventional raising / lowering apparatus. It is sectional drawing which follows the VI-VI line of FIG. It is a figure for demonstrating the effect | action of the raising / lowering apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Lifting platform 3 Pantograph type lifting platform support mechanism 4 Lifting table drive mechanism 5 Linear guide 6 Ball screw 7 Drive motor 8 Coil spring

Claims (2)

A base, a lift provided above the base, a pantograph lift support provided between the lift and the base, and the pantograph lift support via the pantograph lift support A lifting platform driving mechanism for driving the lifting platform; a plurality of linear guides installed on an upper surface of the base; and a ball for sliding the slider of the linear guide in a horizontal direction. In a lifting device configured to have a screw and a drive motor that rotationally drives the screw shaft of the ball screw,
An elevating apparatus characterized in that an elastic body that compresses and deforms by receiving a pressing force from the elevating base or the base when the elevating base is lowered is provided on the upper surface of the base or the lower surface of the elevating base.   The lifting apparatus according to claim 1, wherein a plurality of the elastic bodies are provided on the upper surface portion of the base or the lower surface portion of the lifting table.

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